This design of hull forces the craft higher and higher the faster it goes. When it is high on the plane and almost hanging on the last few inches of propshaft
it can fall off the plane either way, usually to the right (Starboard) side because of engine
torque. The full size boats were fitted with 2 or 3 engine
s to help counteract this.
The British Powerboat Company, who originally designed the hull that Vospers copied back in the 1930s/40s also noticed this which led to double skinning the hull with 1 inch thick mahogany
for extra strength against pounding and falling on the waves. Lowering the drive angle of the propellor shafts and adding more weight
from the C of G back to near the stern
this 3 screwed designed hull with one mainshaft usually so do not have the benefit of shaft rotation
to stabilise the boat at speed.
It was in the 1960's that Fairey engine
ers had the same problems (Swordsman,Huntsman etc) They came up with large transom mounted powered Trim Tabs. Their boats had similar problems and only one shaft in the main.
I suggest you try fitting 2 x 2 inch wide by 1 inch deep trim tabs at the very bottom of your transom midway between the keel and the chine
as well as move your battery pack
s forward a bit initially. Try some fast tests with this, you only need 2 to 4 degrees of down on the tabs initially. Add removeable weight
s near the CG as needed, a bit at a time but don't stop the bow lifting up onto the plane.
Have fun, best of luck.